| Patents for A. H. Opsahl |
Patents 1 -
9
of 9
      |
| Number | Date | Patentee | Title | Type |
| 407,806 | Jul. 30, 1889 | J. Peebles, E.J. Woolf | Valve Gear for Engines | steam engine valve gear |
| 455,872 | Jul. 14, 1891 | J. Peebles, E.J. Woolf | Valve Gear for Engines | steam engine valve gear |
| 475,427 | May 24, 1892 | E.J. Woolf | Single Cylinder Compound Engine | steam engines |
| 521,278 | Jun. 12, 1894 | E.J. Woolf | Engine | steam engine valve gear |
| 531,285 | Dec. 18, 1894 | E.J. Woolf | Engine | steam engine valve gear |
| 750,449 | Jan. 26, 1904 | W.J. Gillard | Depth Gage | micrometer depth gauges |
| 849,891 | Apr. 09, 1907 | E. Ellingson | Combination Wrench | alligator wrenches |
| 919,370 | Apr. 27, 1909 | N. Lund | Combination Tack Hammer and Puller | tack hammers |
| 1,128,135 | Feb. 09, 1915 | G.H. Hammond | Valve Pick-Up Tool | |
